An aircraft makes a horizontal circular turn. The air craft enters the turn with velocity of v = 300i+400j, 20 seconds later it leaves the turn with velocity of v = 400i - 300j. Determine the acceleration of the aircraft in g units.

Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?